Hello Sir and welcome to the forum. You are not the problem here and should not apologize no matter how much you are asking for your rig. I have been around this forum since it's inception and can tell you that it has went downhill with some of the members here.
Unfortunately the members who are posting rude replies on how overpriced your rig is, have no intention of purchasing it. Anyone who is here to shame you into lowering the price into a low ball figure should take their comments to a PM or other form of communication.
I am following the new and used vehicle market as well as electronic, steel, wood, and other manufacturing. Your asking price is right in line to the market value. RV's, trailers, campers and trucks new and used are very hot items right now and it's a sellers market. This is going to change in the upcoming months/years. We just don't no when.
Well built rigs such as yours that sold for a lot less in the used market a few years back are commanding a premium price right now and a lot of sellers are getting more for a used rig than when it was new. Please take some of those posts claiming the "low ball value" of your rig with a grain of salt. I would remain firm with your asking price to lowest cost you have in mind to sell it for.
I had a coworker a few years back who paid almost 90,000.00 for a Ford F350 pretty loaded. It's what the market was. That same truck now is well north of 100,000.00 new at the dealer. Take a look at the teardrop market. High quality off road teardrops were less than 20K just 2 years ago. Those same ones are going for 30k - 40k+ today. And as mentioned from other members some of them have a 1 year or more lead time. How do you think the quality of those slammed together rigs are going to be?